THE FREMF TRUSTS - Condensed Consolidated Statements of Operations (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Interest income	$ 8,954,000	$ 9,832,000	$ 10,289,000	$ 9,983,000	$ 10,169,000	$ 9,719,000	$ 17,551,000	$ 21,516,000
Interest expense	5,589,000	6,036,000	6,242,000	5,776,000	5,571,000	4,604,000	12,981,000	18,398,000
Net interest income	3,365,000	3,796,000	4,047,000	4,207,000	4,598,000	5,115,000	4,570,000	3,118,000	$ 15,413,842	$ 17,400,715
General and administrative fees									(4,335,376)	(4,006,774)
Net income	$ 1,222,000	$ 2,158,000	$ 1,394,000	$ 1,475,000	$ 350,000	$ 4,353,000	$ (21,490,000)	$ 11,315,000	6,248,890	(5,471,462)
FREMF Trusts
Variable Interest Entity [Line Items]
Interest income									78,361	20,891,992
Interest expense									0	19,652,710
Net interest income									78,361	1,239,282
General and administrative fees									0	(887,388)
Unrealized gain (loss) on multi-family loans held in securitization trusts									694,339	(6,398,348)
Net income									$ 772,700	$ (6,046,454)